Electromagnetic switch



Dec. 7 1926. U

K. BOHME ET AL ELECTROMAGNETIC SWITCH Filed Nov. 13, 1924 HIT-5:-

Patented Dec. 7, 1926.

UNITED STATES PATENT OFF-ICE.

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Application filed November 13, 1924. Serial No. 749,630.

The invention relates to electro-magnetic switches, which are combined to form a group for the purpose of interconnecting lines having movable and stationary con- 6 tacts, the latter being assembled in a cylindrical contact bank.

The object of the invention is to cheapen the construction and as much as possible reduce the size of the apparatus. a

This is achieved according to the invention by mounting the contacts of the contact field on a common contact bank, which is fixed to cross plates supported by longitudinal supports and shaped like switches.

} The-support for the contacts of the contact field, according to the invention comprises. asheet of flexible insulatlng material, which preferably can comprise a single piece common to several switches.

A specially simple arrangement according to the invention consists in using a common .yoke for the operating magnets of the switches combined in a group, this yoke at the same time forming the support for the armature of the electro-magnet. Thereby the magnetic properties of the operating magnets are improved as well as the advantages of space and manufacture.

The invention is illustrated by way of ex ample in the Figs. 1-3, which show stepping switches combined to form a singile group of switches, such as are used for setting up connections in automatic or semi-automatic telephone systems.

Fig. 1 shows a front view and Fig. 2 a

plan view seen from above, some of the movable switching mechanism being omitted.

Fig. 3. is a sectional elevation on the'line AB of the Fig. 1 seen from the side.

The switch group shown contains four rotary switches I-IV of similar construction and having a common cylindrical contact bank. The contact bank preferably consists of a continuous insulatirig P ece 1 provided with holes for its supports and for passing through the stationary contacts 3, made of barewires 2. The insulating material preferably comprises a sheet of material such as .Pertinax, ing heat and pressure, and 1s fixed at its order to save space, the insulating material which is bent by suitably apply holes 4 provided for this purpose in the pegs 5 of the holding plates 6. These holdingplates 6 have a semi-cylindrical shape and have their ends mounted on pillars 8 fixed to the side plates 7. For each switch I-IV of the grou there is such a plate 6, to the pegs 5 of WlllCh the bent insulating material is fixed at its holes 4. Each of the plates 6 also serve to support the wiper shaft 9 of a switch. For this purpose there is an extension 10 at the ,middle of the plates 6, having a fork shaped slit at its free end, thereby enabling the shaft 9 with its wipers 11 and the switch wheel 12 to be easily inserted. In

is made as thin as possible, the conductors 2 of the stationary contacts 3 are fixed in a reliable manner to the holes in the material and the latter is prevented from altering its position at the outer side of the holding plate 6, this being effected by providing holding bands 13 at the rear wall of the insulating material 1 opposite the holding plates 6, these bands being made of tin and after passing over the supporting pillars 8 lie firmly against the rear Wall of the insulating cylinder.

At one end of the contact field there are, besides the contacts 3 formed by wire loops, also contact blades 14, which are always in contact with movable contact wipers 11. These blades are fixed to the insulating material at two places and for this purpose a second insulating piece 15 is provided at this end parallel to the cylinder 1. but separated 85 from the latter b a space so as to facilitate the fastening of the blades.

. An angle iron 17 forms a common support for the motor magnets 16 required by the switches I--IV and is fixed to the bent ends 18 of the outer supporting plates 7. The longitudinal edge 19 of the angle iron 17 forms a fulcrum, on which lie the armature 20 of the electro-magnets 16, so that special supporting pieces are not required for this purpose. This also serves to improve the closure of the magnetic circuit between the core of the magnets and their armatures 20. The common yoke 17 also enables the auxiliary pieces of apparatus partsto be easily fixed and this yoke finally renders very rigid the whole switch group and especially its comparatively weak contact bank.

Ilach armature of the electro-magnets 16, located on the knife edge 19 of the angle iron 17, carries a pawl 21, which, actuated paratus does not affect the invention. It is merely essential that the whole device he usedin combination with the particular construction of the contact bank.

IVhat we claim is: I

1. In a telephone system, a group of automatic rotary switches, wipers for said switches, bank'contacts accessible to said 'wipers and comprising loop shaped projections of bare multiple wires, a. single semicircular sheet of insulating material supporting and forming the sole insulation for said bank contacts and said wires. I

2. In a telephone system, a group of automat-ic-switches, wipers for the switches having rotary movement, bank contacts accessible tOxStllCl wipers, a single sheet of curved insulating material, common to said switches, said bank contacts formed of bare wires threaded through said single sheet of curved insulating material into the plane of movement of said wipers.

3. In a telephone system, automatic switches, wipe-rs for said switches, movable in certain plane's, a curved sheet of insulating material, bank contacts accessible to said wipers, said contacts comprising a plurality of integral longitudinally arranged parallel wires insulated from each other and grouped in-sets and projecting through said curved sheet of insulating material and into the plane of movement of said wipers.

.4. In a telephone system, a plurality of automatic switches, a sheet of semi-circular insulating material, contacts accessible to said switches and comprising loops of bare wires formed on the inside of said insulating material, and bare wire multiples for said contacts formed on the opposite and rear side of said insulating material.

5. In a telephone system, automatic switches, a frame for supporting said switches,,a multiple contact bank for said switches comprising contacts, a single sheet of insulating material supporting and insulating said contacts from each other, said oontactbank supported by said frame upon which said switchesare mounted.

6. In a telephone system, automatic switches, wipers for said switches, multiple bank contacts accessible to said Wipers, a curved sheet of insulating material, said contacts being supported by and arranged to project through apertures in said sheet of insulating material, and an auxiliary frame member located between adjacent ones of said switches for supporting said wipers .and said sheet of insulating material.

7 In a telephone system, a switchbank comprising a single curved sheet of insulating material perforated at regular intervals to form I'OWS,=pb&l6 wires looped through said perforations to form bank contacts, automatic rotary switches having wipers for engaging said contacts, said sheet of insulating material common to a plurality of said switches and equi-distant at all points from the axis of rotation of said wipers of said switches.

8. In a telephone system, automatic switches, wipers for said switches, a multiple bank of contacts accessible to said' wipers comprising a curved sheet of insulating material having the contacts projecting through apertures therein, and an auxiliary frame member located between adjacent ones of said switches and supporting said wipers and said sheet of insulating material.

9. In a telephone system, a plurality of automatic switches having bank terminals, a switch frame, said switches mounted on cross plates on said frame, a sheet of curved insulating material integral with the bank terminals of said switches, said sheet of in sulating material fixed tosaid cross plates by means of pegs and holes in said insulating material.

10. In a telephone system, automatic switches, bank terminals for said switches, a sheet of curved insulating material supporting said terminals, semi-circular cross plates supporting said switches on the concave side of said sheet of insulating material,- and holding hands extending around the rear or convex side of said sheet of insulation for firmly holding said sheet of insulating material against said cross plates.

11. Automatic switches, cross plates supporting the switches, a terminal bank for said switches comprising a single curved sheet of insulating material mounted on said cross plates, bank contacts formed on the inside of said insulating material, bare multiple wires for said bank contacts extending through and on the outside of said insulating material, holding hands, said bank contacts and said multiple wires secured to said insulating material by said cross plates and said holding bands;

12. In a telephone system, automatic switches, a'common mounting frame for said switches, motor magnets for said switches mounted on said common frame, cross plates between each of said switches, a sheet of curved. insulating material containing. the' bank contacts of said switches, said frame and said cross plates serving as a support for said insulating material.

13. In a telephone system, automatic single motion switches, wipers for said switches, a single curved sheet of insulating material containing multiple bank contacts accessible to said wipers of said switches, motor magnets having armatures for driving said Wipers over said bank contacts, and a common element supporting said motor magnets, said armatures and said insulating material.

In testimony whereof we aflix'our signatures.

KURT BOHME. OTTO RINKOW. 

